Sanding-machine.



SANDING MACHINE.

lAPPLICATION mso AuG.|7,1916.

l @46958 l Patented Nov. 20, 1917.

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JOSEPH T. LINDSEY, 0F LEOMINSTER,. MASSACHUSETTS.

SANDING-MACHINE.

To all wlw'm t may concern:

Be it known that I, JOSEPH T. LINDSEY, a citizen of the United States, residing at Leominster, in the county of Worcester and Commonwealth of Massachusetts, have invented a new and useful Improvement' in Sanding-Machines, of which the following, together with the accompanying drawings, is a specification.

The object of my present improvement is to provide a sanding machine for the purpose 4of rounding the corners of woodwork and producing a uniform curvature of a rectangular corner.

I am aware thatjsanding machines have been devised for the purpose of abrading and polishing circular articles. The purpose of my present invention, however, is to render an angular surface curved with a uniform curvature extending equally upon `opposite sides of the angle treated. I accomplish this result by the construction and arrangement of parts as hereinafter described, the novel features being pointed out in the appended claims.

Referring .to the accompanying drawings,

Flgure 1 is a plan view of my improved Fig. 2 is a side elevation, shown in section, on the plane of the broken line 3 3,

Fig. 1, and

Fig. 3 is a side elevation of the stand for supporting the pulleys for supporting the sanding belts in proper position to contact with the work, and illustrating the adjusting mechanism by which said pulleys are raised or lowered.

Similar reference characters refer to similar parts in the di'erent figures.

The framework of my machine comprises posts 1, 1 at the corners of the framework, cross girths 2 near the bottom of the frame, upon which is supported a shaft 3 provided with tight and loose pulleys 4 and 5 and a drum 6, by which motion is imparted to the sanding belts 7, 8 and 9. `The sanding belts 7, 8 and 9 are supported near the top of the machine by pulleys 10, 11 and 12, supported in yokes 13, le andl, sald yokes being capable of sliding 1n ways formed in a casting 16 mounted upon a girth 17 forming a portion of the framework. y

The yoke 14 is adjusted in a vertical plane by means of a screw 18, and the yokes 13 and 15 are adjusted by screws 19 and 2O Specification of Letters Patent.

VApplication led August 17, 1916.V Serial No. 115,524.

ri sanded consisting, 1n place in Ways which converge toward the top of the machine. The sanding belts 7, 8 and 9 are tightened by means of tightening pullegs 21,' 22 and 23 carried on the ends of levers 24, 25 and 26, said leversbeing arranged at one end of the framework of the machine and being drawn upward to press the t1ghtening pulleys against the belts by sprmgs 27 and eyebolts 2 8.

Mounted upon the top of the framework is a supporting trough for the work to be in the present instance, of the sides 29 and 30, placed at an angle of forty-five degrees to each other, and forming a right angled bed 32 on which the work is supported, bearing against the opposite sides of the trough, as represented in Fig. 2, in which the piece of work to be sanded is represented at 31. At the bottom of the trough is an opening 33 extending over the pulleys 10, 11 and 12, of suflicient width to allow the sanding belts to be brought in contact with the corner of the work.

In the operation of the machine the piece of work to be treated is moved longitudinally through the trough 32, with one of its corners fitting the right angled xcorner of the trough, as represented in Fig. 2. The outer corner of the trough 32 is cut away, as shown in Fig. 2, to provide for the vertical adjustment of the pulleys l0, 11 and' 12, which are so adjusted as to remove the requi site amount of stock to produce a rounded corner. The yokes carrying the outer pulleys 10 and 12 are adjustable in ways placed at the proper angle to coperate with the central pulley 11 to produce a corner of the desired curvature. While the abrasion of the stock is in a line transverse to the corner, the required amount to be removed by each of the sanding belts is so slight that, by ithe proper adjustment of the pulleys 10, 11 and 12, the contacting surfaces of each of the three sanding belts 7, Sand 9 will produce a corner of the desired curvature. When the desired rounding of the corner has been secured by the adjustment of the pulleys 10, 11 and 1,2, the abrasion of the stock will be uniform throughout the entire length of the corner as the work is moved ,longitudinally in the trough 32.

Patented Nov. 2o, 191%'.

`When the corners of Woodwork are rounded by moving an abraslve substance, such as sand paper, lengthw1se the corner, the

amount of stock removed is liable to vary,

not only between diderent pieces but also between diii'erent parts of the same piece. My method of rounding the corners avoids this irregularity by moving the belts'transversely of the movement of the piece of Work, and also by supporting the abrasive belt during its contact with the Work upon the periphery ot an unyielding roll.

ll claim,

l. lin a machine of the class described, a framework, a drum journaled therein, a multiplicity of abrading belts carried by said drum, a pulley for each of said belts, and a trou h tor supporting the Work with a corner o the Work exposed to the action of said belts.

2. ln a machine of the class described, an angular trough for supporting the Work, a multiplicity of abrading belts, said trough having an opening through which a corner of the Work is exposed to said belts, and idler pulleys for holding said belts in contact with the Work.

3. ln a machine of the class described, an angular trough for supporting the Work, a multiplicity of abrading belts, said trough having an opening through which a corner of the work is exposed to said belts, idler' ity of abrading belts, means for driving said belts transversely to the work, idler pulleys for holding said belts in Contact With the Work, and means for the independent adjustment ot each of said idler pulleys toward or away from the Work.

5. lin a machine of the class described, a multiplicity of abrading belts, a trough for supportingthe Work With one of its corners exposed to said belts, a pulley for each of said belts, whereby the belt is held in contact with the Work as it passes around the pulley, and means for adjusting said pulleys relatively to the vvorlr.

6. lin a machine of the class described, an angular trough for supporting the work and having an opening at its apex through which a corner of the Work is exposed, three abrading belts, pulleys for carrying each of said belts, with the axis of one pulley in alinement with the apex of said trough and with the axes of the remaining pulleys on opposite sides of said central pulley, and.

means for independent adjustment of each of said pulleys relatively to said trough.

7. lin a machine of the class described, a series of abrading belts, an angular trough for supporting the Work in position to present a corner to the action of said belts, means for moving the belts transversely to the Work, a series of pulleys for supporting the belts While in contact with the Work, and means for holding said pulleys in staggered relation to each other.

JOSEPH T. LlNDSEY. 

